Plasticator for long glass fiber-filled thermoplastics

LMG has introduced a new 150-mm plasticator, is used to prepare long glass fiber-filled thermoplastic materials for compression molding.

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LMG (De Pere, Wis.) has introduced a new 150-mm plasticator, is used to prepare long glass fiber-filled thermoplastic materials for compression molding. It features a reciprocating screw that is said to be to be gentle on fibers. The longer fibers that result improve physical properties in the molded part. The barrel temperature is reportedly accurately controlled and has a maximum temperature of 750°F/400°C. LMG has replaced the traditional hydraulic screw drive with an electric drive in this new plasticator, which reduces energy use and noise levelds. During the plasticating process, the reciprocating screw conveys the material to the front of the barrel. At this point the barrel exit is closed by a hardened hydraulic knife, which can be heated. When the material pressure in front of the screw overcomes the backpressure on the screw, it will start to reciprocate. Once it reaches its programmable material volume set point, the screw will stop, the knife at the front of the barrel will open and the screw will be hydraulically driven forward. The machine has a stroke of 500 mm/19.7 inches and can deliver a 14-lb/6.4-kg extrudite. Once it is completely forward, the hydraulic guillotine knife will close, separating the material extrudite from the material still in the barrel. The output (extrudite) of the plasticated shot volume is programmable and can be completed in one piece or in up to three pieces. Converyors are also available to transport extrudite from the plasticator to the compression press.